Although I have scanned colour negative and slide film, for the most part I scan Ilford FP4 and HP5 for printing on an Epson 3880. So my experience is really about B&W scanning from 120 negs.
I have a couple of Polaroid Sprintscan 120s which I bought in the mid 1990s - now obsolete but still working with Firewire (now via firewire/thunderbolt cable) and Mac OSX 10.6.8 which I keep on bootable external disk - using Silverfast Studio - can't remember off hand which version. They and the Nikon Coolscans were, at the time, considered to be the best of the rest of the domestic scanners - i.e. excluding the hugely expensive Hasselblad scanners.
They still work but over the years I have had scans done on high end Hasselblad scanners, a couple of hugely expensive professional drum scans and a lot from an Epson v850 flat bed.
There is no doubt that the expensive drum scans were better than all of the rest. The Hasselblad X1 and X5 came second (and very little difference between the two). That is when viewed at 100% on a screen. But here I run the risk of heresy. As regards the quality of prints from well exposed negatives, there is really very little difference in the prints between the Polaroid, Hasselblad and Epson scans when viewed from a reasonable distance (I print A3+ and A2). If you want to try and emulate Ansel Adams with the maximum range from Zone 0 to Zone 10 with maximum shadow detail then probably you are going to want to go as high end as you can afford. (But then again will your digital printer really produce the goods?) But for what I do - slightly contrasty with as deep blacks as I can get, moderate shadow detail and smooth highlights - there really isn't a dramatic difference.
$14k for new Nikon Coolscan seems absurd (when new the Polaroids were c£2,000). Are you going to be able to get it serviced or repaired? Almost certainly not. For that money you could pick up new Flextight X1 with change or a 2nd Hand X5. Yes they are still Firewire but work with Macs on the firewire/thunderbolt.
However I would suggest you look at the Epson v800 - 1/4 of the price of the Braun (of which I know nothing). Then look at what your ultimate goal is and decide if you want to spend a lot more money to get to where you want to go.